IB bug fix: ibv_create_comp_channel has symbol version 1.0 only in libibverbs

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2776 ba6dc0ae-232f-0410-883f-9ebac64fc565
IB: remove some compile warnings

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2777 ba6dc0ae-232f-0410-883f-9ebac64fc565